Method and apparatus for fast pore pressure measurement during drilling operations
    23.
    发明授权
    Method and apparatus for fast pore pressure measurement during drilling operations 有权
    钻孔过程中快速孔隙压力测量的方法和装置

    公开(公告)号:US07331223B2

    公开(公告)日:2008-02-19

    申请号:US10248535

    申请日:2003-01-27

    IPC分类号: E21B47/06

    CPC分类号: E21B49/10 E21B47/06

    摘要: A method and apparatus for measuring the pressure of a formation penetrated by a wellbore is provided. A downhole tool is positioned in the wellbore and a probe is extended therefrom into sealing engagement with the formation. A piston in the probe is retracted therein where by a cavity is defined for receiving a fluid from the formation. A pressure underbalance in the cavity draws fluid from the formation into the cavity. An oscillator may be used to fluctuate the flow of fluid into the cavity. A pressure gauge is used to measure the pressure of fluid in the cavity.

    摘要翻译: 提供了一种用于测量由井筒渗透的地层的压力的方法和装置。 井下工具定位在井筒中,探针从其中延伸成与地层密封接合。 探针中的活塞缩回到其中,通过空腔限定用于从地层接收流体。 空腔中的压力不平衡将流体从地层吸入空腔。 可以使用振荡器来波动流入空腔的流体。 压力表用于测量空腔中流体的压力。

    Method for determining pressure of earth formations
    25.
    发明授权
    Method for determining pressure of earth formations 有权
    确定地层压力的方法

    公开(公告)号:US07031841B2

    公开(公告)日:2006-04-18

    申请号:US10769014

    申请日:2004-01-30

    IPC分类号: E21B49/10

    CPC分类号: E21B47/06 E21B49/008

    摘要: A method for determining formation pressure at a depth region of formations surrounding a borehole, including: keeping track of the time since cessation of drilling at the depth region; deriving formation permeability at the depth region; causing wellbore pressure to vary periodically in time and determining, at the depth region, the periodic and non-periodic component of pressure measured in the formations; determining, using the time, the periodic component and the permeability, the formation pressure diffusivity and transmissibility and an estimate of the size of the pressure build-up zone around the wellbore at the depth region; determining, using the time, the formation pressure diffusivity and transmissibility, and the non-periodic component, the leak-off rate of the mudcake at the depth region; determining, using the leak-off rate, the pressure gradient at the depth region; and extrapolating, using the pressure gradient and the size of the build-up zone, to determine the formation pressure.

    摘要翻译: 一种用于确定钻孔周围地层深度区域的地层压力的方法,包括:跟踪在深度区域停止钻孔的时间; 在深度区域导出地层渗透率; 导致井筒压力在时间上周期性地变化,并且在深度区域确定在地层中测量的压力的周期性和非周期性分量; 使用时间确定周期分量和渗透率,地层压力扩散系数和透射率以及在深度区域周围井筒周围的压力积聚区的尺寸的估计; 使用时间确定地层压力扩散率和透射率以及非周期性分量,泥饼在深度区域的泄漏速率; 使用泄漏率来确定深度区域处的压力梯度; 并使用压力梯度和积聚区的尺寸进行外推,以确定地层压力。

    Perforating Gun
    28.
    发明申请
    Perforating Gun 有权
    穿孔枪

    公开(公告)号:US20070158109A1

    公开(公告)日:2007-07-12

    申请号:US11306785

    申请日:2006-01-11

    IPC分类号: E21B7/00 E21B43/11

    CPC分类号: E21B43/117

    摘要: The present invention provides an apparatus for use in perforating a well having a plurality of explosive charges. Each explosive charge is adapted to generate a perforation tunnel in the formation adjacent to the well. In one embodiment, explosive charges are oriented to create perforation tunnels that converge at a location within the formation in order to create a fracture initiation plane capable of mitigating or avoiding hydraulic fracturing complications.

    摘要翻译: 本发明提供一种用于对具有多个爆炸装药的井进行穿孔的装置。 每个爆炸装置适于在邻近井的地层中产生穿孔。 在一个实施例中,爆炸装药被定向以产生会聚在地层内的位置的穿孔隧道,以便产生能够减轻或避免水力压裂并发症的断裂起始平面。